邯郸-峰峰矿区不同变质程度煤中有机氮的赋存形态  

Organic nitrogen forms of different rank coals in Handan-Fengfeng mining area,China

作　　者：郝国强 胡社荣[3] HAO Guoqiang;HU Sherong(School of Mining and Geomatics Engineering,Hebei University of Engineering,Handan 056038,China;Hebei Colleges R&D Center of Coal Resources,Handan 056038,China;School of Geoscience and Survey Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]河北工程大学矿业与测绘工程学院,河北邯郸056038 [2]河北省高校煤炭资源开发与建设研发中心,河北邯郸056038 [3]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《煤田地质与勘探》2020年第1期70-76,共7页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41072119)。

摘　　要：氮是煤中的常见元素之一,煤中氮的赋存形态多样且随煤阶发生变化。以邯郸–峰峰矿区为例,利用X射线光电子能谱(XPS)实验,研究不同变质程度煤(R_(ran)=1.08%~3.67%)中有机氮的赋存形态,探讨煤中各形态有机氮相对含量随煤阶的变化规律。结果表明:按N 1s XPS谱图分峰峰值的结合能可将煤中氮的形态归为N-6、N-5、N-Q和N-X四种;研究区煤中N-5的相对含量最高,且随着煤阶的增高而降低;N-Q的相对含量随着煤阶的增高而增高;煤中N-6的相对含量随煤阶呈"增–减–稳"的变化规律;N-X的相对含量为9.1%~35.1%,其与煤阶关系不明显;在煤阶Rran=1.08%~1.47%的范围内,煤的N 1s XPS谱图中缺失N-Q分峰,表明褐煤中相对含量最高的质子化吡啶氮在此阶段已几乎全部去质子化而转化为吡啶氮。不同变质阶段氮的赋存形态变化特征对燃煤发电及煤化工领域煤化学参数选取提供参考。Nitrogen is one of the common elements in coal.The occurrence forms of nitrogen in coal are various and vary with coal rank.Based on X-ray photoelectron spectroscopy(XPS),taking Handan-Fengfeng mining area as an example,organic nitrogen forms of different rank coals(Rran=1.08%–3.67%)were studied,and the variation of the relative abundance of each organic nitrogen with rank was further discussed.The results show that four kinds of nitrogen forms are considered for the coals according to binding energies of N 1s XPS sub-peaks,corresponding to N-6,N-5,N-Q and N-X.N-5 is the most abundant organic nitrogen and its relative abundance decreases as coal rank increases,while N-Q shows opposite trend.The variation of the relative abundance of N-6 with rank shows“increasing-decreasing-stable”trend,and N-X accounts for 9.1%–35.1%of the total organic nitrogen,whose changing with coal rank is not obvious.Protonated pyridinic nitrogen,a type of N-Q,which dominates in lignite,almost disappears at a coal rank range from Rran 1.08% to Rran 1.47% due to the loss of oxygen groups and deprotonation,resulting in the absence of N-Q sub-peaks in the XPS spectra.

关 键 词：有机氮 赋存形态 煤阶 X射线光电子能谱 邯郸–峰峰矿区 

分 类 号：P57[天文地球—矿物学] TQ530[天文地球—地质学]